QuizClash - In QuizClash, you can challenge your friends or random opponents to a game of trivia.
EduDo - EduDo is a video discussion platform
Trivia Crack - Produced by Etermax, Trivia Crack lets players answer trivia questions and compete against other people on mobile devices.
Alcamy - Free, open self-learning platform. Learn & teach anything.
Quesly - Test your knowledge, choose a category with 10 questions and solve your test in 100 seconds.
Courseroot - Biggest online course database on the web